Refactor controller. Move stuff to traits.

1 files changed, 178 insertions, 0 deletions

diff --git a/src/Controller/View/Twig.php b/src/Controller/View/Twig.php
new file mode 100644
index 0000000..ee5d4ce
--- /dev/null
+++ b/src/Controller/View/Twig.php
@@ -0,0 +1,178 @@
+<?php
+
+namespace Jasny\Controller\View;
+
+use Jasny\Flash;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * View using Twig
+ */
+trait Twig
+{
+    /**
+     * Twig environment
+     * @var \Twig_Environment
+     */
+    protected $twig = null;
+
+    /**
+     * Get server request
+     * @return ServerRequestInterface
+     */
+    abstract public function getRequest();
+
+    /**
+     * Get server response
+     * @return ResponseInterface
+     */
+    abstract public function getResponse();
+
+    /**
+     * Add a global variable to the view.
+     * 
+     * @param string $name   Variable name
+     * @param mixed  $value
+     * @return $this
+     */
+    public function setViewVariable($name, $value)
+    {
+        if (!$name) throw new \InvalidArgumentException("Name should not be empty");        
+
+        $this->getTwig()->addGlobal($name, $value);
+
+        return $this;
+    }
+    
+    /**
+     * Expose a function to the view.
+     * 
+     * @param string $name       Variable name
+     * @param mixed  $function
+     * @param string $as        'function' or 'filter'
+     * @return $this
+     */
+    public function setViewFunction($name, $function = null, $as = 'function')
+    {
+        if ($as === 'function') {
+            $this->getTwig()->addFunction($this->createTwigFunction($name, $function));
+        } elseif ($as === 'filter') {
+            $this->getTwig()->addFilter($this->createTwigFilter($name, $function));
+        } else {
+            throw new \InvalidArgumentException("You should create either function or filter, not '$as'");
+        }
+        
+        return $this;
+    }
+
+    /**
+     * Add extension to view
+     *
+     * @param object $extension
+     * @return $this
+     */
+    public function setViewExtension($extension)
+    {
+        $this->getTwig()->addExtension($extension);
+
+        return $this;
+    }
+
+    /**
+     * View rendered template
+     *
+     * @param string $name   Template name
+     * @param array $context Template context
+     * @return ResponseInterface
+     */
+    public function view($name, array $context = [])
+    {
+        if (!pathinfo($name, PATHINFO_EXTENSION)) $name .= '.html.twig';
+
+        $twig = $this->getTwig();
+        $tmpl = $twig->loadTemplate($name);
+
+        $response = $this->getResponse();
+        $response = $response->withHeader('Content-Type', 'text/html; charset=' . $twig->getCharset());
+        $response->getBody()->write($tmpl->render($context));            
+
+        return $response;
+    }
+
+    /**
+     * Get twig environment
+     *
+     * @return \Twig_Environment
+     */
+    public function getTwig()
+    {
+        if ($this->twig) return $this->twig;
+
+        $loader = $this->getTwigLoader();
+        $this->twig = $this->getTwigEnvironment($loader);
+
+        $extensions = ['DateExtension', 'PcreExtension', 'TextExtension', 'ArrayExtension'];
+        foreach ($extensions as $name) {
+            $class = "Jasny\Twig\\$name";
+
+            if (class_exists($class)) $this->setViewExtension(new $class());
+        }
+        
+        $uri = $this->getRequest()->getUri()->getPath();
+        
+        $this->setViewVariable('current_url', $uri);
+        $this->setViewVariable('flash', new Flash());
+
+        return $this->twig;
+    }
+
+    /**
+     * Get twig loasder for current working directory
+     *
+     * @return \Twig_Loader_Filesystem
+     */
+    public function getTwigLoader()
+    {
+        return new \Twig_Loader_Filesystem(getcwd());
+    }
+
+    /**
+     * Get twig environment instance
+     *
+     * @param \Twig_Loader_Filesystem $loader
+     * @return \Twig_Environment
+     */
+    public function getTwigEnvironment(\Twig_Loader_Filesystem $loader)
+    {
+        return new \Twig_Environment($loader);
+    }
+
+    /**
+     * Create twig function
+     *
+     * @param string $name          Name of function in view
+     * @param callable|null $function 
+     * @return \Twig_SimpleFunction
+     */
+    public function createTwigFunction($name, $function)
+    {
+        if (!$name) throw new \InvalidArgumentException("Function name should not be empty");
+
+        return new \Twig_SimpleFunction($name, $function ?: $name);
+    }
+
+    /**
+     * Create twig filter
+     *
+     * @param string $name          Name of filter in view
+     * @param callable|null $function 
+     * @return \Twig_SimpleFilter
+     */
+    public function createTwigFilter($name, $function)
+    {
+        if (!$name) throw new \InvalidArgumentException("Filter name should not be empty");
+
+        return new \Twig_SimpleFilter($name, $function ?: $name);
+    }
+}